From what I heard from someone a few days ago, there will indeed be 3 tiers of elites, not 4 and that they will use the 'Admiral' moniker, a departure from both US & AA's current nomenclature:
-Admiral Elite
-Admiral Gold
-Admiral Platinum
Supposedly the US Silver elites will not have much of anything (not that they do now) so I assume it will be the rest of us DMP folks (Gold, Plat, CP) just slide up one level in theory, or maybe the Plat & Gold Go to Gold, and Silver becomes Elite. It keeps with the OW three tiers, and makes everyone get a 'newly named' status level. The 'Admiral Elite' sounds a bit odd, because it seems there would be much confusion about if someone was an 'elite' or an 'Elite'...
Granted this is a speculation thread, and the person who told me said none of it was fully decided yet, but this does tend to make sense a bit.